linux-kernel - Re: Can a buffer allocated by "vmalloc( )" be used to make DMA transmission (the buffer will be used by BIO structure) on X86

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Date:	Wed, 17 Jan 2007 15:11:27 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	"Yu-Chen Wu" <g944370@...nthu.edu.tw>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: Can a buffer allocated by "vmalloc( )" be used to make DMA transmission (the buffer will be used by BIO structure) on X86_64 platform?

At Tue, 16 Jan 2007 22:37:56 +0800,
Yu-Chen Wu wrote:
> 
> Hi all,
> Can a buffer allocated by "vmalloc( )" be used to make DMA transmission (the
> buffer will be used by BIO structure) on X86_64 platform?
> I need a big buffer (cache) maybe 64MB or bigger, so I call vmalloc to
> allocate the buffer.
> If possible, how to get the pages in the buffer?

You can resolve the page via vmalloc_to_page(), and pass it in nopage
callback.

Takashi
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